TST: Remove unnecessary caching during tests

[scottclowe]

No description provided.

[codecov]

Codecov Report

Merging #226 (1218e64) into master (7446e87) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #226   +/-   ##
=======================================
  Coverage   92.43%   92.43%           
=======================================
  Files           8        8           
  Lines         938      938           
  Branches      197      197           
=======================================
  Hits          867      867           
  Misses         34       34           
  Partials       37       37           

Flag	Coverage Δ
nbsmoke	65.77% <ø> (ø)
unittests	92.00% <ø> (ø)

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